Dark mode or customizable pallette

[maxwofford]

Know this seems extravagant, but I find I'm most creative at night and really want to use blot on a dark screen.

I'm 100% ok with not having official support for dark mode; but currently the way the turtle is rendered, extensions like "dark reader" will black out the canvas entirely:

Short of a full dark-mode, I'd like the ability just to change the color of the pen in the renderer to work with the extension.

[AverseABFun]

I also want this feature.